Method of manufacturing crossed bottom bags with tubular sleeve inserts



Oct. 11, 1960 Filed Feb. 11, 1957 C. H METHOD OF MANUFACTURING ONSELWITH TUBULAR SLEEVE INSERTS CROSSED BOTTOM BAGS 2 Sheets-Sheet 1 Oct.11, 1960 c. HONSEL 2,955,517

METHOD OF MANUFACTURING CROSSED BOTTOM BAGS WITH TUBULAR SLEEVE INSERTSFiled Feb. 11, 1957 2 Sheets-Sheet 2 "Hum IN VEN TOR. CARL HO/VSE Lclosed by bending the sleeves.

United States Patent METHOD OF MANUFACTURING CROS SED BOgITOM BAGS WITHTUBULAR SLEEVE IN ERTS Carl Honsel, Herforderstrasse 285, Bielefeld,Germany Filed Feb. 11, 1957, Ser. No. 639,547- a Claims priority,application Germany Feb. 14, 1956 2 Claims. (Cl. 93-35) The presentinvention relates to crossed bottom bags of the type provided withinserts in the form of tubular sleeves or valves which, upon filling ofthe bags, are

It is known to provide crossed bottom valve bags by means of machineswith a so-called tubular sleeve in the valve for the purpose of closingthe crossed bottom bag involves the shortcoming that there is notsuificient space available for folding in the tubular sleeve.

It' is an object of the present invention to eliminate theseshortcomings. It is an object to provide a method which permits the useof a machine of simple construction which operates faultlessly even athigh production rates. I

Accordingly, in accordance with the invention the valve tube is drawn inthe usual manner and is advanced by the draw rollers under a knifesection. After the completed tubular blank is separated, the side edgesof the following endless tubulated band are provided with slots and theband is moved below the drawing members which after the cutting conductthe tubular blank to a gripper cylinder. This gripper cylinder isprovided at the lower part with a known gripping device which holds theadvancing tubular blank. As soon as the folding blade, which workstogether with the gripper cylinder, has produced a fold, the valve tubeopens and the end is pulled over and laid flat in the manner of a crossbottom. Thus there is formed in the desired manner a folded over part orflap of the valve tube.

Accordingly, the method in accordance with the invention resides in thata valve insert made preferably from an endless tubular band is providedat the forward end along its lateral edges with cuts. This valve insertis then folded over at its cut end in the manner of the crossed bottomof a bag and is inserted in the opened crossed bottom of a bag in such amanner that the folded over flap forms a pocket at the bottom side ofthe valve insert into which the free end of the valve insert can beplaced. The cuts may also be provided in the associated paper web evenbefore the forming of the tubulation for the valve insert.

Further details of the invention and the manner of carrying the sameinto practice will appear if reference is had to the embodimentillustrated in the drawing in which:

Fig. l is a schematic illustration of a machine for forming andinserting the tubular blank into the crossed bottom which is still open,

Fig. 2 is a plan view in accordance with Fig. 1 indicating the differentsteps of operation for producing the tubular sleeve,

Fig. 3 illustrates the open crossed bottom with the tubular sleeveinserted,

Fig. 4 is a cross-section along line A-.A of Fig. 3,

Fig. 5 is a detailed view of the arrangement for feeding the crossedbottom bags to and out of the gripper cylinder pair and,

Fig. 6 is a detailed view of the areas of glue application to thecrossed bottom.

v The paper web 1 is drawn from a paper supply roll which is notillustrated, and a tube is formed in the usual manner by way of the tubeforming device 2. The endless tubular band is advanced by the drawrollers 3, 4 to the knife section 5, 6. The lower roller 5 is providedwith transverse and longitudinal grooves. The upper roller 6 carries atransverse knife 7 and two longitudinal knives 8 which cooperate withthe grooves of the cutting cylinder 5.

Now if a portion of the tubular band is cut off by the transverse knife7 to form a blank 9, the advancing tubular band 1 continues to advanceand is provided by longitudinal'knives 8' with cuts 10. The feedingrollers 11, 12 advance the cut tubular blank 9 to a folding bladecylinder 13 and a folding gripper cylinder 14. The folding bladecylinder 13 is provided with a folding blade 15, and the folding grippercylinder 14 carries a folding gripper 16. Cylinder 14 is also providedwith retaining means 16a which hold the lower end 19 of the valve insertor blank 9. These holding means 16a are preferably formed as a suctiondevice or as'a gripper in a manner known per se. As soon as the tubularblank 9 with the folding line 17 is passed onto the folding grippercylinder 14 and the folding blade 15 and advanced, the upper flapportion 18 bends upwardly while the lower flap portion 19 is held uponthe folding gripper cylinder 14 by the holding means 16a. The tubularblank 9 thus mounted is then advanced by the presser roller 20 to thegripper cylinder 21, while the upper flap portion 18 is bent by guide19a and rolled tight by the presser roller 20.

The cuts 10 can also be made by cutters provided upon the foldinggnipper cylinder 14. Likewise, these longitudinal cuts can be providedeven before entrance of the tubular -band 1 upon the tubulation formingdevice 2.

The gripper cylinder 21 advances the tubular blank 9 with the foldedover flap portion 18 into the plane which is indicated at II in Fig. 1.In this plane the cross bottom bag is moved with the crossed bottomsturned up transversely to the feeding arrangement. The gripping cylinder21 operates together with a counter roller 21a.

As shown more clearly in Fig. 5 the gripping cylinder 21 which rotatescounter-clockwise seizes the tubular blank by means of gripper 21b whichadvances it into the plane I-I where. the cross bottom bag 23' isadvanced from left to right.

Before this bag reaches the gripping cylinder 21 the crossed bottom bag23 is advanced by the pair of rollers 28, 29. Roller 28 which isprovided with a glue applying segment 30 is associated with a gluecontainer 31. The roller 32 picks up. glue from glue container 31 andapplies it to segment 30.

The segment 30 is arranged in a manner that glue is applied to theturned up crossed bottom as illustrated in Fig. 6, to areas 33, 3'4, 35,3'6, 37 and 38. When the tubular blank 9 d8 applied to the turned upcrossed bottom by means of the gripper cylinder arrangement 21, 21a, 21bglue has been deposited at 37 for the purpose of gluing down thetubulation 9 by means of the turned over flap 18. The glue areas 33, 34,35, 36 serve for the purpose of effecting the closure of the crossedbottom at the corner flaps 24, 24a after folding over bottom flaps 39,40 along lines '41, 42, while the gluing surf-ace 38 serves the purposeof gluing the longitudinal seam after the folding of bottom flaps 39 and'40.

The folding of bottom flaps 39 and 40' is effected with means known perse along the path from the gripping cylinder arrangement 21, 21a, 21b tothe roller pairs 43, 43a and 44, 44a which latter rollers serve the solepurpose of seating the planes which are now glued to one another afterclosing of the crossed bottom.

Fig. 3 illustrates the manner in which the tubular blank 9 is providedupon the turned up bottom 22 of the cross bottom bag 23 against the edge25 of the corner portion 4 so that the flap portion 19 extendsover theedge 25 of the corner portion 24 into the-bag while the folded over flap18 of blank 9 extends with its fold line 17 flush with the transverseedge 25 of the corner portion.

In Fig. 4 it can be seen that a pocket 26 is formed by the turned overflap 18. 'The filling of the bag 23 is effected in the known mannerthrough the tubular insert 9 which serves as a valve. After filling ofthe bag the outer end 27 of the tubular insert 9 is manually placed intopocket 26, thus obtaining tight closure of the valve insert 9.

Having now described my invention with reference to the embodimentillustrated, I do not wish to be limited thereto, but what I desire toprotect by Letters Patent of the United States is set forth in theappended claims. 4

I claim:

1. Method for the manufacture of crossed bottom bags provided withtubulation inserts comprising the steps of forming a continuous tubularband, providing the material constituting said tubular band withlongitudinal slots along the portions forming the lateral edges thereof,cutting the slotted band across one end of the slots to form blanksdefining itubu-lation inserts of predetermined lengths, crimping eachblank transversely of the other ends of said slots to form flaps,turning up one flap and folding the same back on the blank, placing atubulation insert thus formed into the Open bottom of a crossed bottombag with the turned over flap facing downwardly and with the crimp lineflush with the transverse edge of the corner fold of the bag and withthe other flap over the bottom flap surface of the bag and gluing saidturned over flap to said corner fold, thereby forming between saidturned over flap and the tubular portion of said insert a pocket adaptedto receive the free end of the insert.

2. Method for the manufacture of crossed bottom bags provided withtubulation inserts comprising the steps of forming a continuous tubularband, providing the material constituting said tubular band withlongitudinal slots along the portions forming the lateral edges thereofand simultaneouslycut-t-ing the slotted band across one end of saidslots to form blanks defining tubulation inserts of predeterminedlengths, crimping each blank transversely of the other ends of saidslots to form flaps, turning up one flap and folding the same back onthe blank, placing a tubulation insert thus formed into the open bottomof a crossed bottom bag with the turned over flap facing downwardly andwith the crimp line flush with the transverse edge of the corner fold ofthe bag and with the other flap over the bottom flap surface of the bagand gluing said turned over flap to said corner fold, thereby formingbetween said turned over flap and the tubular portion of said insert apocket adapted to receive the free end of the insert.

References Cited in the file of this patent UNITED STATES PATENTS736,673 Bartholomew Aug. 18, 1903 743,124 Wikander Nov. 3, 19032,570,047 Burroughs Oct. 2, 1951

